something like this:

> struct S {
>   // variables...
>   string doGen(int n) { return ""; }
>   alias gen = memoize!doGen;
> }

The error I got is:

> Error: need 'this' for 'doGen' of type 'string(int n)'

I can't make doGen static because it access non-static struct members... can I workaround this?

On Tuesday, 26 December 2017 at 00:47:14 UTC, Marc wrote:
> something like this:
>
>> struct S {
>>   // variables...
>>   string doGen(int n) { return ""; }
>>   alias gen = memoize!doGen;
>> }
>
> The error I got is:
>
>> Error: need 'this' for 'doGen' of type 'string(int n)'
>
> I can't make doGen static because it access non-static struct members... can I workaround this?

i don't want to mislead you and i don't know if this is somehow possible but what about some ufcs magic?


  string doGen(S s, int n) {
    return "hello ".repeat().take(n).join();
  }

  struct S {

    int x;

    auto gen() @property {
      return memoize!doGen(this, x);
    }

  }

  void main() {
    S s = S(5);
    s.gen.writeln;

    s.x = 10;
    s.gen.writeln;

    s.x = 15;
    s.gen.writeln;

    s.x = 20;
    s.gen.writeln;
}